<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        var myname = prompt('请输入您的姓名');
        var age = prompt('请输入您的年龄');
        var home = prompt('请输入您的家乡');
        alert('大家好,我叫' + myname + '今年' + Number(age) + '岁了' + '我来自' + home);
    </script>
</head>

<body>

</body>

</html>